> I wish there was a modern platform (not just a hobbyist Raspberry Pi kit or something) in the Switch or DS form factor, that boots straight into a coding environment like the legendary Commodore 64 and other "computer-consoles" of that era, with a central app store for indie devs to publish to for free.

I’m not sure if this will do what you want, but it is Linux on a DS! No active developers at the moment. They have instructions to build your own images as well as some software built for it.

https://www.dslinux.org/